Sound machine



FIG. 1 is an isometric top, left and front side view of a sound machine, showing my new design;

FIG. 2 is a front side view thereof;

FIG. 3 is a rear side view thereof,

FIG. 4 is a top side view thereof;

FIG. 5 is a bottom side view thereof;

FIG. 6 is a right side view thereof; and,

FIG. 7 is a left side view thereof.

The portions of the article in broken lines are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a sound machine, as shown and described. 